Orbit Type: HEO > Highly Elliptical Orbit

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Launched on August 12, 2003, SCISAT helps a team of Canadian and international scientists improve their understanding of the depletion of the ozone layer, with a special emphasis on the changes ... occurring over Canada and in the Arctic.

SCISAT focuses its attention in the stratosphere, where the ozone layer is located. SCISAT is providing the most accurate measurements to date of chemicals that affect ozone, which blocks the sun's biologically damaging ultraviolet radiation and prevents most of it from reaching the Earth's surface.

http://www.nasa.gov/missions/earth/scisat.html

http://earth.esa.int/SCISAT-1ACE/
http://www.nasa.gov/missions/earth/scisat.html